Drill-feeding device



Feb. 10, 1931.

w. PRELLWITZ ETAL DRILL FEEDING DEVICE Filed July 17, 192B INVENTORS lz'am Paella/'2' 134E, sseilfllfi'lhelm M THEIR TORNEY Patented Feb. 10, lQEl'l WILLIAM PBELLWI'I'ZAND RUSSELL H, WILHELZH, F EASTUH, IFEHNSYLVAEEIA, A8-

BIGNORS T0 INGEBBOLL-RAND CQMP, 0F JEREEY GI'JLW, JEHEEY, A GOR- I POBATION 0] NEW JERSEY DRILL-FEWIE'G DEVICE Application filed July 1?, 1923. Qerial Ito. fiilfttfifiv.

This invention relates to rock drills, but more particularly to a feeding device for fluid actuated rock drills of the drifter type.

The objects of the invention are to maintain a suitable pressure on the rock drill for feeding it towards the work in accordance with the penetration of the drill steel into the material being drilled and to facilitate the operation of withdrawing the drifter from the work.

Other objects will he in pert obvious end in part pointed out hereinafter In the drawings illustrating a practical application oi the invention end in which similar reference characters refer to similar parts,

Fi ly in section, of r, roclr drill and its shell having the invention applied thereto,

Figure 2 is e plen view, psrtly in section,

Figure 3 isa plan view in section of the throttle valve for the feeding cylinder,

Figures 4, 5 end 6 are transverse views taken on the lines 4-4, 5==-=-5 and t--@ looking in the direction indicated hy the arrows and showing the throttle valve in various pe sitions for controlling the feeding device, and

Figure 7 is a transverse view, in section I taken on the line 7--'( of Figure Hooking in the direction indicated by the arrows.

Referring to the drawings, A designates nerally a rock drill comprising a percussive cylinder B on which may he formed the usual guides (not shown) which coo crate with ideways C of a shell D where y the rock rill A is supported, On the front end of the cylinder A is a front head E into which extends a working im lement F for cutting holes G into material intended to be drilled, such as the rock H. A back head J forms a closure for the rearward end of the cylinder B and said back head J and the front head E may be secured to the cylinder by menus of spring pressed holts K.

On the side oi the cylinder B is mounted a valve chest L in which may hedis posed e suitable distributing valve (not shownhior oiiectingthe distrihutionoi pressure fluid to the cylinder B. Such pressure fluid is conveyed 4 till irorn suitable source of supply the valve re 1 is e longitudinal elevation, part chest ill by means of s connection or hose 9 and passes through a passage 1? in the valve chest controlled by e throttle velve, only the lever Q of which is shown.

The shell'D may he of the well known type having a conical emension E for cooperation with suitable clamping means, such as are usually provided on a drill column or quarry bar for clamping the drilling meshenism thereto.

ln accordence with the giresent invention, ineens are provided for euvancing the rock drill A towards the work, such as the rock H, and for retracting it therefrom through the medium of ressure fluid after the hole has been drills To this end the cylinder A is provided with e. in lit which, in the construction shown, is o substantially the same length as'the cylinder A and extends into the shell D. lug ll is provided with a recess S into which extends e feeding cylinder 'l of a suitable length, depending upon the distance which it is desired toceuse the rock drill to travel relatively to the work.

The feeding cylinder '1 may consist of a tube heving open ends and on the rearward end oi? said feeding cylinder is disposed a cap ll forming e. heed therefor, Prefernhly, the or) U is provided with holes V on opposite sides to receive tie rods or bolts W which reject with their opposite ends through lugs on the lug it for securing the cap U and thus also the cylinder T securely to the lug R. A shoulder Yis formed in the recess to not as ii seat for the inner end of the cylinder T.

The recess is iorrned'in the renrward end of the lug ll, thus leeving s well ffi st the front end of the recess and s hole 35 is formed in the wall to accommodate s piston rod 0 which extends into the feeding cylinder end is connected to a piston 02 in the feeding cylinder T.

,The opposite end of the rod 6 is in this instance fixedly secured to e plate 6 bolted to the front end of the shell l), the end f of the rod 0 heing threeded to receive a nut 9'. Preferably the outer end or the tore b is enlarged somewhat to receive suitable Packing means it which surround the rod c tor pre venting leakage of press fluid. from. the recess S and a packing gland j is threaded into the outer end of the bore (Z for compressing the packing 7L.

Suitable means are provided for sclectively exposing the ends of the piston b to pressure fluid to actuate the drill A longitudinally of the shell D, both for feeding the drill steel F into the rock H and for retracting it therefrom. The means provided for this purpose in the present instance consist of a throttle valve is disposed in a throttle valve chamber 0 formed in a boss 2) at the front end of the cylinder B. Suitable passages Q and r in the cylinder lead from the throttle valve chamber 0 to the rearward and front ends respectively of the feeding cylinder T. From the rearward end of the passage g extends a tube 8 seated with one end in the cap for conveying pressure fluid from the passage g to the rearward end of the feeding cylinder 'l.

The throttle valve Z" in this instance has a passage to register wth the passages r and g and said passage L is in constant communication with the passage l in the valve chest L through a passage a formed in the cylinder A and the valve chest la.

lin order to enahlepressure fluid to be exhausted from the ends of the feedingcylin der T, the throttle val is provided with an external groove n which may simultaneously register with either of the passages r or g and with an exhaust port in in the boss 37. The throttl valve 79 is provided with the usual lever .93 for manually rotating the throtte valve.

In the operation of he device. the throttle valve 7: may be rotated to a position to admit presure fluid through the passage 1" into the front end of the feeding cylinder as illustrated in Figure 5. Pressure fluid thus admitted into the front end of the feeding cylinder will force the roclr drill in the direction of the rock H. The percussive element of the drill may then he in operation'and the pressure fluid in the front end of the feeding cylinder will exert pressure sufficient to advance the rock drill'toW-ards the Work in accordance With the penetration of the drill steel F into the rock.

After the reel: dri i has Ward most lir of its in may be rotated to t ljigure 6 to carry the ,7 with the passage 9. The groove o Will then he in a osition to estahlis communication between the passage 1' and the exhaust port w. In this position of the throttle valve, the pressure fluid previously used for feeding the roclr drill to the work Will be exhausted to the atmosphere and pressure fluid will he admitted through the passa e g and the tube a into the rearward end of t 1e feeding cylinder. Such pressure fluid will cause the rock cached the forthrottle valve :ion shown in e i liiLO registry sgrorave drill to he quickly retracted from the work. After another drill steel has been substituted for one previously used, the throttle valve K: may he again reversed to supply pressure fluid to the front end of the feeding cylinder to feed the roclr drill in a forwardly direction.

After a drilling operation has been completed and it is desired to transport the drilling mechanism from one drilling site to an other, the rock drill A may be fed in a for- Wardly direct-ion until the ln -R lies adjacent the front end of the shell In this position substantially the entire feeding cylinder T Will lie Within the shell D. The throttle valve is may then be rotated to a neutral position as illustrated in Figure 4: to estab' lish communication between both ends of the feeding cylinder and the atmosphere through the various passages and ports leading from the throttle valve chamber 0 to the feeding cylihden.

We claim:

1. In a drill feeding device, the combination of a rock drill having a percussive cylinder and a shell for the rock drill, a lug on the cylinder having a recess, a feeding cylinder extending with one end into the recess and fixedly secured to the lug, a Wall in the lug forming a head for one end of the feeding cylinder and having a bore, a piston in the feeding cylinder, a rod for the piston secured to the front end of shell and extending through the bore, said rod lying Wholly Within the shell, and means for controlling the supply of pressure fluid in the ends of the feeding cylinder to actuate the rock drill. longitudinally of the shell.

2. In a drill feeding device, the combination of a rock drill having a percussive cylinder and a shell for the rock drill, a lug on the cylinder having a recess, a feeding cylinder extending with one end into the recess and fixedly secured to the lug, a Wall in the lug forming head for one end of the feeding cylinder and having a bore, a piston in the feeding cylinder, a rod for the piston se cured to the front end of the shell and extend ing through the bore, said rod lying wholly Within the shell, a throttle valve on the for Ward end of the percussive cylinder, and passages leading from the throttle valve to the ends of the feeding cylinder for conveying pressure fluid to and from the feeding cylinder for actuating the rock drill in the shell,

8. In a drill feeding device, the COIHlJlDZL tion of a rock drill having a percussive cyl inder and a shell for the rock drill, a in on. the cylinder having a recess, a feeding cylin der extending with one end into the recess and fixedly secured to the lug, a Wallin the lug forming a head for one end of the feed ing cylinder and having a bore, a piston in the feeding cylinder, a rod for the piston secured to the front end of the shell and extend ing through the bore, said rod lying Wholly lot within the shell, a boss on the front end of the percussive cylinder having a valve chamher and an exhaust port, a passage constantly conveying pressure fluid from a source of supply to the valve chamber, inlet passages leading from the valve chamber to the ends of the feeding cylinder, and a throttle valve in the valve chamber controlling the passages 'and the exhaust port.

4. In a rock drill feeding device, the combination of a rock drill havin a percussive cylinder and a shell for the roc drill having longitudinally extending guideways whereon said rock drill is slidably mounted, a lug on the cylinder extending into the shell, 9. recessin the lug substantially parallel with the cylinder and opening at the rearward end of the lug, a feeding cylinder extending into the recess and fixedly secured to the lug, a wall in the lug forming a closure for the front end of the feedin cylinder and having a bore, a plate at the ront end of the shell form- .ing an abutment for the lug, a piston in the feeding cylinder, a rod for the piston extending through said bore and being securedto the plate, said rod lying wholly within said shell, and means for selectively admitting pressure fluid into the ends of the feeding cylinder to advance and retract the rock drill along the guidewa s, said feeding cylinder in its forward limiting position lyin with sllibstantially its entire length withm the s ell.

5. In a rock drill feeding device, the combination of a rock drill havin a percussive cylinder and a shell for the roc drill having longitudinally extending guideways whereon said rock drill is slidably mounted, a lug on I the cylinder extending into the shell, a recess in the lug substantially parallel with the cylinder and opening at the rearward end of the lug, a tube extending with one end into the lug, a cap forming a closure for the other end of the tube, a pair of holes in the lug and in the cap, a pair of bolts extending through the holes, nuts on the bolts for clampin the lug, the tube and thecap fixedly toget er, said tube and said lug forming a feedmg cylinder for the rock drill and havin a piston, a rod secured to the piston exten ing through the lug and being secured to the front end of the shell, and means for admitting pressure fluid into the ends of the feeding cylinder to advance and retract the rock drill along the guideways, the means for admitting pressure 'fluid into the rear end of the feeding cylinder including a tube extending with its ends into the percussive cylinder and the cap and clamped therebetween by the bolts and the nuts.

6. In a rock drill feeding device, the combination of a rock drill having a percussive cylinder and a shell for the rock drill having lon 'tudinally'extending guidewa whereon sai rock drill is slidably mounte a lug on the cylinder extending into the shell, a recess in the lug substantially parallel with the cylinder and opening at the rearward end of the lug, a feeding cylinder extending into the the percussive cylinder havin a valve chamher and an exhaust port for t e valve chamber, a supply passage constantly conveying pressure fluid from a source of supply to the valve chamber, inlet passages leading from the valve chamber to the front and rear ends respectively of the feeding cylinder, and a valve in the valve chamber adapted to concurrently control the admission of ressure fluid into one inlet passage and the ex aust of pressure fluid from the other inlet passage, said valve also being adapted to simultaneously establish communication between both inlet passages and the exhaust port.

In testimony whereof we have signed this specification.

WILLIAM PRELLWITZ. RUSSELL H. WILHELM. 

